func writeinfo(ctxt *Link, syms []*Symbol, funcs []*Symbol) []*Symbol {
if infosec == nil {
infosec = Linklookup(ctxt, ".debug_info", 0)
}
infosec.R = infosec.R[:0]
infosec.Type = obj.SDWARFINFO
infosec.Attr |= AttrReachable
syms = append(syms, infosec)
if arangessec == nil {
arangessec = Linklookup(ctxt, ".dwarfaranges", 0)
}
arangessec.R = arangessec.R[:0]
var dwarfctxt dwarf.Context = dwctxt{ctxt}
for compunit := dwroot.Child; compunit != nil; compunit = compunit.Link {
s := dtolsym(compunit.Sym)
// Write .debug_info Compilation Unit Header (sec 7.5.1)
// Fields marked with (*) must be changed for 64-bit dwarf
// This must match COMPUNITHEADERSIZE above.
Adduint32(ctxt, s, 0) // unit_length (*), will be filled in later.
Adduint16(ctxt, s, 2) // dwarf version (appendix F)
// debug_abbrev_offset (*)
adddwarfref(ctxt, s, abbrevsym, 4)
Adduint8(ctxt, s, uint8(SysArch.PtrSize)) // address_size
dwarf.Uleb128put(dwarfctxt, s, int64(compunit.Abbrev))
dwarf.PutAttrs(dwarfctxt, s, compunit.Abbrev, compunit.Attr)
cu := []*Symbol{s}
if funcs != nil {
cu = append(cu, funcs...)
funcs = nil
}
cu = putdies(ctxt, dwarfctxt, cu, compunit.Child)
var cusize int64
for _, child := range cu {
cusize += child.Size
}
cusize -= 4 // exclude the length field.
setuint32(ctxt, s, 0, uint32(cusize))
newattr(compunit, dwarf.DW_AT_byte_size, dwarf.DW_CLS_CONSTANT, cusize, 0)
syms = append(syms, cu...)
}
return syms
}
func putdie(linkctxt *Link, ctxt dwarf.Context, syms []*Symbol, die *dwarf.DWDie) []*Symbol {
s := dtolsym(die.Sym)
if s == nil {
s = syms[len(syms)-1]
} else {
if s.Attr.OnList() {
log.Fatalf("symbol %s listed multiple times", s.Name)
}
s.Attr |= AttrOnList
syms = append(syms, s)
}
dwarf.Uleb128put(ctxt, s, int64(die.Abbrev))
dwarf.PutAttrs(ctxt, s, die.Abbrev, die.Attr)
if dwarf.HasChildren(die) {
return putdies(linkctxt, ctxt, syms, die.Child)
}
return syms
}